addendum Re: working with images (PIL ?)

[Ivan Illarionov]

On Wed, 14 May 2008 14:35:25 -0400, Poppy wrote:

> I've put together some code to demonstrate what my goal is though
> looping pixel by pixel it's rather slow.
> 
> import Image
> 
> def check_whitespace():
>     im = Image.open("\\\\server\\vol\\temp\\image.jpg")
> 
>     size = im.size
> 
>     i = 0
>     whitePixCount = 0
>     while i in range(size[1]):
>         j = 0
>         while j in range(size[0]):
>             p1 = im.getpixel((j,i))
>             if p1 == (255, 255, 255):
>                 whitePixCount = whitePixCount + 1
>                 if whitePixCount >= 492804:  ## ((image dimensions 1404
>                 x
> 1404) / 4) 25%
>                     return "image no good"
>             j = j + 1
>         i = i + 1
> 
>     print whitePixCount
> 
>     return "image is good"
> 
> print check_whitespace()
> 
> 
> "Poppy" <znfmail-pythonlang at yahoo.com> wrote in message news:...
>>I need to write a program to examine images (JPG) and determine how much
>>area is whitespace. We need to throw a returned image out if too much of
>>it is whitespace from the dataset we're working with. I've been
>>examining the Python Image Library and can not determine if it offers
>>the needed functionality. Does anyone have suggestions of other image
>>libraries I should be looking at it, or if PIL can do what I need?
>>

PIL will do this, use histogram() method of Image objects.

-- Ivan